Window-shade.



I. NIELSEN.

WINDOW SHADE.

APPLICATION FILED MAR. 21, 1912.

Patented Dec. 9, 1913.

BY e/WM ATTORNEY f; T @FFTQ.

WINDOW-SHADE.

Application filed March 21, 1912.

To all whom it may concern:

Be it known that I, Ivnn NIELSEN, a subject of the King of Norway, residing at New Rochelle, in the county of Westchester and State of New York, have invented certain new and useful Improvements in indow-Shades, of which the following is a specification.

Window shades or blinds of ordinary construction have the drawback that when the spring of the roller is released the shade will roll up to its full extent and make a few additional turns before it comes to rest. It is often desired where there are several windows in a room to have the shades on all windows pulled out at an equal length. With the ordinary shades the regulation is tiresome.

The present invention has for its object to improve such shades by a very simple attachment, whereby the rotary movement of the roller may be easily adjusted so as to limit the extent to which the shade is to roll up after its spring is released.

In the accompanying drawing, which forms a part of this specification and in which similar reference characters denote corresponding parts, Figure 1 is an elevation of a window showing the shade in position partly pulled out; Fig. 2 an enlarged longitudinal section through the shade roller and Fig. 3 a cross section on line 33 of Fig. 2.

a denotes a window and 6, Z) the bearings in which the roller d of the window shade c is adapted to be supported by pivots 11, i. The roller d to which the shade is attached to wind on and off comprises a metal spindle cl which at one end has the angular pivot i. Around the wooden sleeve 6Z2 fixed to the spindle (Z is the spring cl of which one end (Z is secured to the latter and the other (Z to the wooden roller d to which in known manner the shade is secured and which incloses the spring (Z As with ordinary shade rollers the end of the spindle d at which the angular pivot I is arranged, is notched as at 6F, and engaging these notches are the pawls or dogs 05 Thus far the construction is well known. Ordinarily when the spring is released by the disengagement of the dogs (Z from the notches (Z of the spindle cl the shade will be caused to roll up to its full extent and the roller to turn around until the spring has run off. To prevent this I extend the Specification of Letters l atent.

Patented Dec. 9%, 1%13.

Serial No. 635,250.

hollow (Z of the roller and provide on its inner circumference two diametrically opposed longitudinal grooves cl, 0!. The spindle d is inwardly extended beyond the wooden sleeve (Z and this extension 6 is screw threaded. The same projects into the extension of the hollow d Working on this threaded extension is a nut f formed with two diametrically opposed wings g, g which are adapted to slidably engage the grooves (5. This nut serves to regulate the extent to which the shade is to roll up and to prevent the roller from male ing additional turns.

The mode of operation is as follows: By removing the roller from the angular bearing 5, the shade is pulled out to the length desired, and while this is done the nut is caused to feed along the threaded extension toward the free end thereof. I/Vhen the spring is released after the roller is put back into its angular bearing 6 the shade will only roll up until the nut which now feeds back into its initial position reaches the other end of the screw or strikes against the sleeve 6Z2. Thus when after adjustment for a certain length has been made as men-- tioned above and after the roller has been put back into its bearing Z) the shade is drawn farther down as indicated by the arrow in Fig. 2, the nutis fed farther toward the free end of the screw and upon releasing the spring the shade will roll up only to the extent of the adjusted length. The shade will be allowed to roll up to its full extent, only when the nut is at the inner end of the screw as shown in Fig. 2. To prevent the nut from screwing tight against the sleeve d a suitable stop may be provided. In the present embodiment of my invention the inner bent end d of the spring acts as a stop preventing the nut from feeding close to the sleeve (Z As various modifications may be made in the construction without deviating from the principle of my invention I wish it to be expressly understood that I do not limit myself to the details described and shown.

Vhat I claim and desire to secure by Letters Patent is:

In a window shade, a hollow roller having a reduced hollow extension at its inner end, a spindle extending centrally through said hollow roller, and having a screw threaded end, a sleeve around said spindle, a coil spring around said sleeve, the outer end of said spring acting as a stop for the nut at the outward stroke of the latter.

In testimony whereof I affix my signature in presence of two Witnesses.

IVER NIELSEN.

of said spring being fastened to the roller and the inner end of said spring being fastened to the said spindle, the threaded end of said spindle extending through said hol- 10W extension, a nut Working on said spindle and having two diametrically opposed pro jections engaging longitudinal grooves in said extension of the roller, the inner end Witnesses:

JAMEs H. Goeem, MAX D. ORDMANN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

